They were all successful in lowering blood sugar and weight. The semi-starvation diet (800 calories per day) was not surprisingly the most powerful for weight loss, but Tony on LCHF – without calorie counting or hunger – did almost as well. Here are his before and after results:

On top of this he managed to get off one of his diabetes medications entirely.

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I weighed over 360 Pounds! Now under 180.
LCHF and intermittently fasting.
I like to share TRF because it fits with lchf.Eric
Eating 9 to 5
180 grams fat 60 to 80 protein and less than or at 30 grams carbs from eggs and vegetables. Am is protein like eggs beef or fish and fat like butter and afternoon is pound of cauliflower with four ounces butter.

The 800 calorie diet may have had biggest weight loss, but it is a starvation diet, nonsustainable, and gives no options of how to maintain weight loss once you have met your goal. Truly a short term fix without any long term usefulness.

I echo David's and Carla's (in another thread) comments here (except it's SEX not Gender that was not in-factored.)

They all lost nearly the same, and all gained nearly the same in positive, curative DIabetes outcomes. The diet the woman (and, one assumes, her children) ate is the most realistic, affordable and more likely to be lifetime possible. It's also more sustainable for our planet. Millions eat a similar diet sustainably, to themselves, their incomes, and to our climate changing world.

To those who say the 800 cal diet is unsustainable, I would think no more so than low-carb, without the fasting component, and perhaps not even then. Fasting brings at least some days calorie averages to 800 I suspect. There is no proof yet that low-carbing can or is sustainable for a lifetime.

Having just read Dr Moseley's book re the 800 cals, he at no time suggests staying on this for life. He recommends going onto the Mediterranean food plan for life after 800 cals for 8 weeks. You need to read the book not just the headlines.